CN104616623A - Method and system for loading information of LED display screen - Google Patents
Method and system for loading information of LED display screen Download PDFInfo
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- CN104616623A CN104616623A CN201510084259.3A CN201510084259A CN104616623A CN 104616623 A CN104616623 A CN 104616623A CN 201510084259 A CN201510084259 A CN 201510084259A CN 104616623 A CN104616623 A CN 104616623A
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Abstract
The invention provides method and system for loading information of an LED display screen. The method comprises the steps of driving a pluggable external infrared emitting module by an intelligent terminal headset interface to send infrared information; paring a control card with an infrared receiving module and a word stock and receiving information; sending the information to the LED display screen to achieve the sending of the LED display content. An LED display screen control system comprises the intelligent terminal, the infrared emission module, the control card and an LED display screen unit plate; the infrared emission module is of an infrared remotely-controlled frame format for achieving the communication protocol of a short control frame. Compared with the wired transmission, the method and system have the characteristics that the functionality is high, and the operation is convenient; the cost is low by being compared with the wireless transmission; the special control card with the word stock and the infrared receiving module is designed for signal transmission, and the reliability characteristic if achieved.
Description
Technical field
The present invention relates to LED display control method and system, be specifically related to LED display control method and system that a kind of intelligent terminal earphone interface realizes infrared remote control.
Background technology
In prior art, LED display displaying contents is loaded into mode by infrared remote control and mainly contains two kinds: adopt infrared remote control base band communications protocol and LED strip mouth standard traffic form, this all needs special remote control keyboard to realize, and there is the problems such as the poor and cost of function limitation, inconvenient operation, effect is higher.Such as, the method be loaded at LED field displaying contents scene has computer serial port, computer network interface, USB flash disk, keyboard special infrared remote control.
LED shows (screen) control system and is usually made up of cell board (LED dot matrix, driving, decoding), control card and power supply etc.The asynchronous loading of displaying contents is normally by the USB port of control card, RS232 serial ports or the input of RJ-45 network interface.In addition, some wireless loading modes are also had to transmit displaying contents, as: WiFi, GPRS, keyboard special infrared remote control etc., Signal transmissions is see Fig. 1.
Such as: existing LED strip mouth standard traffic form ginseng is shown in Table 1, and protocol architecture is illustrated:
| Frame head 0xA5 (8byte) | Header data (14byte) | Data field (Nbyte) | Bag verification (2byte) | Postamble 0x5A (1byte) |
Wherein:
1, frame head: the 0xA5 composition of 8 bytes.
2, postamble: the 0x5A composition of a byte.
3, header data: some attributes of this bag data.Existing control card is not generally with character library, and its character library arranges in software at computing machine, and it is send display dot array data that computing machine sends character by RS-232 serial ports to control card, and the character of a 16*16 dot matrix is 32 bytes.
4, data field: be User Agreement layer data.
5, bag verification: be the CRC16 proof test value of header data and data field.
The whole frame sending a character has 57 bytes.
And the standard that infrared remote control baseband communication agreement is ununified at present, defined by each producer oneself.Therefore, communication protocol reaches tens kinds more than, and conventional just has ITT agreement, NEC agreement, Sharp agreement, Philips RC-5 agreement, Sony SIRC agreement etc.Maximum be exactly NEC agreement.The data layout of NEC agreement includes preamble code, user code, user code (or user code radix-minus-one complement), button key and key radix-minus-one complement, last position of rest.Position of rest mainly plays buffer action, does not generally judge, also ignores during programming.Wherein, data encoding is 4 bytes 32 altogether, as shown in Figure 2.First character joint is user code, and second byte may also be user code, or the radix-minus-one complement of user code, specifically determined by manufacturer, 3rd byte is exactly the key data code of current button, and the 4th byte is the radix-minus-one complement of key data code, can be used for the error correction to data.This NEC agreement, represent that the mode of data is directly perceived unlike the such as UART learned before us, but each data itself also needs to encode, and carry out carrier modulation again after coding.
The free time of the carrier wave+4.5ms of preamble code: 9ms.
The free time of the carrier wave+560us of bit value " 0 ": 560us.
The free time of the carrier wave+1.68ms of bit value " 1 ": 560us.
Note: carrier wave square wave frequency: 37.91kHz, dutycycle 1/3.
Summary of the invention
For prior art above shortcomings, the object of the invention is to introduce a kind of brand-new method, the scene that the intelligent terminal taking the lead in realizing carrying with realizes LED display content is loaded into, expand the kind of loading terminal, realize convenient, fast, that cost is extremely low object, and a kind of LED display screen information loading method is provided
The present invention also provides a kind of LED display control system being realized infrared remote control by intelligent terminal earphone interface.
Realize above-mentioned purpose, the present invention adopts following technical scheme: a kind of LED display screen information loading method, it is characterized in that, adopt and drive pluggable external infrared transmission module to send infrared ray information by intelligent terminal earphone interface, carry out matching and receiving information with the control card of band infrared receiving module and character library, pass to the transmission that LED display realizes LED displaying contents.
Further, the present invention also provides a kind of LED display control system, comprises intelligent terminal, infrared transmission module, control card and LED display cell board;
Described intelligent terminal runs APP software and PPM coding is carried out to displaying contents, coded pulse (PAM) is modulated on carrier wave, by earphone (left and right sound channels) the interface driver infrared transmission module of intelligent terminal, send modulation of infrared rays signal; Described infrared transmission module is pluggable to be connected with intelligent terminal; Described control cassette tape infrared receiving module, band dot matrix word library, short frame traffic agreement, the infrared receiving module in control card receives the infrared ray that infrared transmission module sends, and carries out demodulation, decoding, obtains the region-position code of displaying contents; To control card sending area bit code, control card takes out corresponding character according to region-position code to intelligent terminal in dot matrix word library storer by infrared, by LED display cell board display character.
Described APP software has man-machine interface, utilizes the character input method input displaying contents of intelligent terminal; Also have speech identifying function, operator needs the content of display by voice informing APP, and APP is shown as word after identifying; By APP, can also display effect be set.After operator confirms input content, APP obtains region-position code, carries out encoding, modulating the earphone interface sending signal to intelligent terminal.
Compared to existing technology, the present invention has following beneficial effect:
Invention introduces a kind of brand-new LED display display information loading method, have unique advantage with existing Measures compare:
1, LED display screen information loading method of the present invention, realizes LED display displaying contents by using intelligent terminal and is loaded into, namely drive external transmitter module to send infrared ray information by the earphone interface of intelligent terminal and carry out signal transacting.Adopt conventional mobile phone or other mobile terminals, only need (in mobile phone) that APP is installed and realize information loading, without the need to increasing any burden, the infrared transmission module that only needs one are slight just can send to LED display the content wanting to show, and provides great convenience.
2, LED display control system of the present invention, only provides infrared transmission module and special control card, and do not need special remote control keyboard can realize LED display screen information and be loaded into, function must be improved, more convenient operation, better effects if.The present invention, compared with wire transmission, has functional strong, easy to operate feature; Compared with wireless transmission, there is the advantage that cost is low.Carry out Signal transmissions by the special control card of design band character library and band infrared receiving module, there is the feature of reliability.
3, in order to adapt to the feature of infrared remote control communication, the communication protocol of short control frame has been created.Its unique distinction is: in order to significantly reduce transmission byte number, significantly simplifies existing LED communications protocol; Change transmission character pattern coding into sending area bit code (comprising word-base chip in special control card) simultaneously; According to the applied environment of LED display, the frame format of infrared remote control is simplified, changing the error correcting system of infrared remote control, its objective is to reduce transmission byte as far as possible, increase the transmission quantity of information of unit interval, reduce the access time, improve communication reliability.
4, infrared radio is adopted to send, freely without caring for; On mobile phone or other mobile terminals, input (phonetic, hand-written, speech recognition) displaying contents at any time, send display immediately.The present invention carries out Signal transmissions by the special control card of design band character library and band infrared receiving module, has the feature of reliability.Adopt the frame format of infrared remote control, realize the communication protocol of short control frame, laser propagation effect is good.
Accompanying drawing explanation
Fig. 1 is prior art typical case LED strip screen display system block scheme.
Fig. 2 is NEC protocol data form.
Fig. 3 is the present invention's infrared loading LED display screen system block scheme.
Fig. 4 is principle of work block scheme of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
one, a kind of LED display screen information loading method:
A kind of LED display screen information loading method, adopt and drive pluggable external infrared transmission module to send infrared ray information by intelligent terminal earphone interface, with band infrared receiving module and carry out matching and receiving information with character library control card, pass to the transmission that LED display realizes LED displaying contents.
See Fig. 3 and Fig. 4, the special APP(application software of the present invention by intelligent terminal runs), described special APP has man-machine interface, utilizes the character input method input displaying contents of intelligent terminal; Also have speech identifying function, operator needs the content of display by voice informing APP, and APP is shown as word after identifying; By APP, can also display effect be set.After operator confirms input content, APP obtains region-position code, carries out PPM coding to displaying contents region-position code, is modulated on carrier wave by coded pulse (PAM); By earphone (left and right sound channels) the interface driver infrared transmission module of intelligent terminal, send modulation of infrared rays signal; Special control card in LED display is feature in order to adapt to infrared remote control communication and custom-designed, having wrapped containing word-base chip, also comprising infrared receiving module to reduce as far as possible to send in byte special control card.Infrared receiving module receives the infrared ray that infrared transmission module sends, and carries out demodulation, decoding, obtains the region-position code of displaying contents; Dot matrix word library is stored in special control card, and to special control card sending area bit code, special control card takes out corresponding character according to region-position code to intelligent terminal in dot matrix word library storer by infrared, by LED display cell board display character.
two, system composition:
A kind of LED display control system, comprises intelligent terminal, infrared transmission module, control card and LED display cell board; Described intelligent terminal runs APP software and PPM coding is carried out to displaying contents, coded pulse (PAM) is modulated on carrier wave, by earphone (left and right sound channels) the interface driver infrared transmission module of intelligent terminal, send modulation of infrared rays signal; Described infrared transmission module is pluggable to be connected with intelligent terminal; Described control cassette tape infrared receiving module, band dot matrix word library, short frame traffic agreement, the infrared receiving module in control card receives the infrared ray that infrared transmission module sends, and carries out demodulation, decoding, obtains the region-position code of displaying contents;
To control card sending area bit code, control card takes out corresponding character according to region-position code to intelligent terminal in dot matrix word library storer by infrared, by LED display cell board display character.
Hardware modifications mainly contains infrared transmission module and special control card.The pluggable connection infrared transmission module of described intelligent terminal, drives external infrared transmission module to send infrared ray information by earphone interface, with band infrared receiving module and carry out matching and receiving information with the LED display of character library control card.Described infrared transmission module adopts the frame format of infrared remote control, realizes the communication protocol of short control frame.Described intelligent terminal refers to mobile phone, panel computer, notebook computer or PC wireless terminal device (can working procedure, have the mobile device of earphone interface).
In order to significantly reduce control word joint number, shorten control frame transmitting time, improve communication reliability, the present invention does the improvement of several respects to Traditional control card:
1, character library is moved on to from computing machine (font cartridge) in control card, a character is sent byte and reduces to 2 bytes from 32 bytes.
2, leave out the beginning and the end, remove the frame head in LED display serial communication frame format, packet header, postamble (amount to 23 bytes, see technical background), change the frame head of infrared remote control into, overall simplicity control frame.
3, the error code of infrared remote control adopts the method for 1:1, and namely 1 data byte just adds a check byte, and make to send data and be multiplied, the present invention adopts 1 byte to realize error checking.
It should be noted that, the communication protocol of existing LED display, sending out a character approximately needs transmission 57 bytes, and add that infrared remote control also needs check code, byte number can be multiplied, and reaches 113 bytes, if send 5 characters to need 185 bytes; According to the bit rate (444bps) of infrared remote control, need transmission 3.3 second; Transmitting time is oversize (infrared remote control of the household electrical appliances such as general televisor sends 4 byte datas, about 60ms consuming time) obviously, and more seriously infrared remote control is that asynchronous communication byte is difficult to synchronously too much, has a strong impact on communication reliability.Therefore, when the present invention controls LED display by infrared remote control, the byte number of transmission should be the least possible.
three, advantage contrast of the present invention:
Be loaded into transmission formula complete list
| Equipment | Annex | Inferior position | |
| Mobile phone is infrared | Mobile phone | Transmitter module | Need infrared transmission module |
| Keyboard special is infrared | Keyboard special | Need keyboard special | |
| RS-232 serial ports | Computer | Serial interface cable | Need computer, need line |
| Network interface | Computer | Netting twine | Need computer, need line |
| USB | Computer | Flash disk | Flash disk medium, amendment inconvenience |
To sum up, the present invention takes the lead in achieving and carries with, and the scene that almost mobile phone of staff one or other intelligent terminals realize LED display content is loaded into, introduce a kind of brand-new method, expand the kind of loading terminal, convenient, fast, cost is extremely low, has novelty meaning.The present invention takes the lead in achieving and carries with, almost the intelligent terminal of staff one realizes the scene loading of LED display content, take the lead in introducing the external infrared transmission module of intelligent terminal audio interface in field of LED display and send displaying contents, in order to realize this invention, according to the feature of infrared remote control communication, devise a total solution, comprising: band infrared receiver, band character library, short frame traffic agreement.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to the technical scheme of invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (5)
1. a LED display screen information loading method, it is characterized in that, adopt and drive pluggable external infrared transmission module to send infrared ray information by intelligent terminal earphone interface, carry out matching and receiving information with the control card of band infrared receiving module and character library, pass to the transmission that LED display realizes LED displaying contents.
2. a LED display control system, is characterized in that, comprises intelligent terminal, infrared transmission module, control card and LED display cell board;
Described intelligent terminal runs APP software and PPM coding is carried out to displaying contents, coded pulse (PAM) is modulated on carrier wave, drive infrared transmission module by the earphone interface of intelligent terminal, send modulation of infrared rays signal; Described pluggable infrared transmission module is connected with intelligent terminal; Described control cassette tape infrared receiving module, band dot matrix word library and short frame traffic agreement, the infrared receiving module in control card receives the infrared ray that infrared transmission module sends, and carries out demodulation, decoding, obtains the region-position code of displaying contents;
To control card sending area bit code, control card takes out corresponding character according to region-position code to intelligent terminal in dot matrix word library storer by infrared, by LED display cell board display character.
3. LED display control system according to claim 2, is characterized in that, described APP software has man-machine interface, utilizes the character input method input displaying contents of intelligent terminal; Also have speech identifying function, operator needs the content of display by voice informing APP, and APP is shown as word after identifying; By APP, can also display effect be set; After operator confirms input content, APP obtains region-position code, carries out encoding, modulating the earphone interface sending signal to intelligent terminal.
4. LED display control system according to claim 2, is characterized in that, described infrared transmission module adopts the frame format of infrared remote control.
5. LED display control system according to claim 2, is characterized in that, described intelligent terminal is mobile phone, panel computer, notebook computer or PC.
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| CN201510084259.3A CN104616623B (en) | 2015-02-16 | 2015-02-16 | A kind of LED display screen information loading method and system |
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| CN201510084259.3A CN104616623B (en) | 2015-02-16 | 2015-02-16 | A kind of LED display screen information loading method and system |
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